Protactinium Fluoride (V)

Protactinium fluoride
Protactinium fluoride
General
Systematic ; name	protactinium fluoride
Traditional names	protactinium fluoride, protactinium pentafluoride
Chem. formula	Paf 5
Physical properties
condition	colorless crystals
Molar mass	326.03 g / mol
Density	6.2 g / cm³
Classification
Reg. CAS number	15192-29-7

Protactinium (V) fluoride is a binary inorganic compound, a salt of the metal protactinium and hydrofluoric acid with the formula PaF ₅ , colorless crystals, sparingly soluble in cold water, form a crystalline hydrate .

Content

1 Receiving
2 Physical properties
3 Chemical properties
4 notes
5 Literature

Getting

The effect of fluorine on metallic protactinium :

{\mathsf {2Pa+5F_{2}\ {\xrightarrow {200-250^{o}C}}\ 2PaF_{5}}}

{\ displaystyle {\ mathsf {2Pa + 5F_ {2} \ {\ xrightarrow {200-250 ^ {o} C}} \ 2PaF_ {5}}}}

Dissolution of protactinium (V) oxide in hot hydrofluoric acid:

{\mathsf {Pa_{2}O_{5}+10HF\ {\xrightarrow {110^{o}C}}\ 2PaF_{5}+5H_{2}O}}

{\ displaystyle {\ mathsf {Pa_ {2} O_ {5} + 10HF \ {\ xrightarrow {110 ^ {o} C}} \ 2PaF_ {5} + 5H_ {2} O}}}

The action of fluoride on protactinium (IV) fluoride :

{\mathsf {2PaF_{4}+F_{2}\ {\xrightarrow {700^{o}C}}\ 2PaF_{5}}}

{\ displaystyle {\ mathsf {2PaF_ {4} + F_ {2} \ {\ xrightarrow {700 ^ {o} C}} \ 2PaF_ {5}}}}

Physical Properties

Protactinium (V) fluoride forms colorless hygroscopic crystals of tetragonal syngony , cell parameters a = 1.1525 nm, c = 0.5218 nm, Z = 8, structure type β-UF ₅ uranium pentafluoride ^[1] .

Slightly soluble in cold water, react with hot.

Forms crystalline hydrate composition PaF ₅ • 2H ₂ O.

Chemical Properties

Crystalline hydrate decomposes upon heating:

{\mathsf {2(PaF_{5}\cdot 2H_{2}O)\ {\xrightarrow {160^{o}C}}\ Pa_{2}OF_{8}\downarrow +2HF+H_{2}O}}

{\ displaystyle {\ mathsf {2 (PaF_ {5} \ cdot 2H_ {2} O) \ {\ xrightarrow {160 ^ {o} C}} \ Pa_ {2} OF_ {8} \ downarrow + 2HF + H_ { 2} O}}}

Reacts with hot water:

{\mathsf {PaF_{5}+5H_{2}O\ {\xrightarrow {100^{o}C}}\ Pa(OH)_{5}\downarrow +5HF}}

{\ displaystyle {\ mathsf {PaF_ {5} + 5H_ {2} O \ {\ xrightarrow {100 ^ {o} C}} \ Pa (OH) _ {5} \ downarrow + 5HF}}}

With concentrated hydrofluoric acid forms a complex compound:

{\mathsf {PaF_{5}+HF\ {\xrightarrow {}}\ H[PaF_{6}]}}

{\ displaystyle {\ mathsf {PaF_ {5} + HF \ {\ xrightarrow {}} \ H [PaF_ {6}]}}}

With a saturated solution of potassium fluoride forms a complex salt:

{\mathsf {PaF_{5}+2KF\ {\xrightarrow {}}\ K_{2}[PaF_{7}]\downarrow }}

{\ displaystyle {\ mathsf {PaF_ {5} + 2KF \ {\ xrightarrow {}} \ K_ {2} [PaF_ {7}] \ downarrow}}}

When fused with alkali metal fluorides, it forms complex salts:

{\mathsf {PaF_{5}+3LiF\ {\xrightarrow {1000^{o}C}}\ Li_{3}[PaF_{8}]}}

{\ displaystyle {\ mathsf {PaF_ {5} + 3LiF \ {\ xrightarrow {1000 ^ {o} C}} \ Li_ {3} [PaF_ {8}]}}}

{\mathsf {PaF_{5}+4CsF\ {\xrightarrow {700-750^{o}C}}\ Cs_{4}[PaF_{9}]}}

{\ displaystyle {\ mathsf {PaF_ {5} + 4CsF \ {\ xrightarrow {700-750 ^ {o} C}} \ Cs_ {4} [PaF_ {9}]}}}

Notes

↑ The Chemistry of the Actinide and Transactinide Elements / Lester R. Morss, Norman M. Edelstein, J. Fuger. - Springer, 2010 .-- T. 1 .-- 874 s. - ISBN 978-94-007-0210-3 .

Literature

Chemical Encyclopedia / Editorial Board: Knunyants I.L. et al. - M .: Soviet Encyclopedia, 1995. - T. 4. - 639 p. - ISBN 5-82270-092-4 .
Chemistry Handbook / Editorial: Nikolsky B.P. et al. - 3rd ed., rev. - L .: Chemistry, 1971. - T. 2. - 1168 p.
Lidin R.A. and other Chemical properties of inorganic substances: Textbook. manual for universities. - 3rd ed., Rev. - M .: Chemistry, 2000 .-- 480 p. - ISBN 5-7245-1163-0 .

[Lester-1] The Chemistry of the Actinide and Transactinide Elements / Lester R. Morss, Norman M. Edelstein, J. Fuger. - Springer, 2010 .-- T. 1 .-- 874 s. - ISBN 978-94-007-0210-3 .

Protactinium fluoride

General
Systematic name	protactinium fluoride
Traditional names	protactinium fluoride, protactinium pentafluoride
Chem. formula	Paf ₅
Physical properties
condition	colorless crystals
Molar mass	326.03 g / mol
Density	6.2 g / cm³
Classification
Reg. CAS number	15192-29-7